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Support custom port for name-server forwarders that would allow using
custom ports in name server forwarders to enable forwarding to
alternative name servers (unbound, stubby, dnscrypt-proxy etc.)
operating on non-default port.
This would also allow using DNS Over TLS in PowerDNS Recursor 4.6 onwards
(pdns doesn't support certificate check for validity yet) by enabling
'dot-to-port-853'. This is set by default if compiled in with DoT support.
See: https://doc.powerdns.com/recursor/settings.html#dot-to-port-853
This also partially implements T921, T2195 (DoT without certificate check).
Implementation details:
- In 'dns/forwarding' configuration, 'name-server' now allows optional
'port' (defaults to 53).
- Instead of modifying 'name-server-ipv4-ipv6.xml.i' to add optional
'port', a new file 'name-server-ipv4-ipv6-port.xml.i' has been used
to avoid impacting other places where it is reused because not all of
them honor ports (mostly VPN related).
- The `host:port` entries to be used by PowerDNS recursor config are
normalized eagerly at the point of loading VyOS `Config` instead of
doing them lazily while rendering the Jinja2 template to keep the
implementation less intrusive. The alternative would entail making
quite a bit of change in how 'vyos-hostsd' processes 'static'
'name_servers' entries or persists their runtime states.
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